通过改变电子传输层TPBi的厚度获得高效率的有机电致蓝色磷光发射

By Changing the Thickness of the Electron Transport Layer TPBi to Obtain High Efficiency Organic Blue Phosphorescent Emission

文章讨论了通过改变电子传输层TPBi的厚度,使结构为ITO/Mo O3/NPB/MCP:Firpic/TPBi/Li F/Al的有机电致蓝光器件的效率获得了较大的提高.实验过程中,使Mo O3、NPB、MCP:Firpic层的厚度分别固定在10、40、30 nm不变,改变TPBi的厚度,使TPBi的厚度分别取35、40、45、50、55 nm.研究发现,当TPBi厚度为45 nm时,在不同电流密度的情况下,器件的电流效率均较大,在电流密度较低时,最大电流效率达到16.9 cd/A.这一结果表明了载流子的注入平衡仍是提高器件发光效率的有效手段.

Discussed in the paper by changing the thickness of the electron transport layer TPBi,the blue organic phosphorescent emitting devicee ’s efficiency have been improved markedly using the structure of ITO/MoO3/NPB/MCP：Firpic/TPBi/LiF/Al. The MoO3 ,NPB,MCP：Firpic layer thicknessh were confined at 10 nm,40 nm and 30 nm,respectively,while the thickness of the TPBi were changed. Make the thickness of the TPBi respectively take 35 nm,40 nm,45 nm,50 nm,and 55 nm,it was found that when TPBi thickness was 45 nm, under the condition of the different current density and current efficiency of the device are larger,the current density is lower,the maximum current efficiency is 16. 9 cd/A. The results showed that the carrier injection balance is still the effective way to enhance the efficiency of the device shine.